package org.smart4j.framework.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * JSON工具类
 *
 * @author zhang
 * @create 2016-11-01-17:10
 */

public class JsonUtil {

    private final  static Logger LOGGER = LoggerFactory.getLogger(JsonUtil.class);


    private final static ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    /**
     * 将POJO转为JSON
     */
    public static <T> String toJson(T obj){
        String json;
        try {
            json = OBJECT_MAPPER.writeValueAsString(obj);
        } catch (Exception e) {
            LOGGER.error("convert POJO to JSON failure", e);
            throw new RuntimeException(e);
        }

        return json;
    }


    /**
     * 将JSON转为POJO
     */
    public static <T> T fromJson(String json, Class<T> type){
        T pojo;
        try {
            pojo = OBJECT_MAPPER.readValue(json, type);
        } catch (IOException e) {
            LOGGER.error("convert JSON to POJO failure",e);
            throw new RuntimeException(e);
        }

        return pojo;
    }
}
